Brexit party activist says he obtained Kim Darroch cables https://www.theguardian.com/politics/2019/jul/21/brexit-party-steven-edginton-darroch-cables?CMP=twt_gu&utm_medium=&utm_source=Twitter#Echobox=1563720156
The person who publicised the Darroch leaks works for the Brexit Party. https://www.theneweuropean.co.uk/top-stories/steven-edginton-on-kim-darroch-leaks-1-6172051